getPicture() from PHOTOLIBRARY returns png with black background instead of transparency

When using cordova-plugin-camera to get an PNG image from the photolibrary, it returns the image but instead of keeping it's orginal transparency, it puts a black background. It should keep the images as is.

options to getPicture():

{ sourceType: Camera.PictureSourceType.PHOTOLIBRARY, destinationType: Camera.DestinationType.DATA_URL }